On Thu, Jul 11, 2024 at 07:08:10AM -0400, Jeff Layton wrote: > Enable multigrain timestamps, which should ensure that there is an > apparent change to the timestamp whenever it has been written after > being actively observed via getattr. > > Also, anytime the mtime changes, the ctime must also change, and those > are now the only two options for xfs_trans_ichgtime. Have that function > unconditionally bump the ctime, and ASSERT that XFS_ICHGTIME_CHG is > always set. > > Finally, stop setting STATX_CHANGE_COOKIE in getattr, since the ctime > should give us better semantics now. Following up on "As long as the fs isn't touching i_ctime_nsec directly, you shouldn't need to worry about this" from: https://lore.kernel.org/linux-xfs/cae5c28f172ac57b7eaaa98a00b23f342f01ba64.camel@xxxxxxxxxx/ xfs /does/ touch i_ctime_nsec directly when it's writing inodes to disk.
